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A fun, free platform for learning modern cryptography

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Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

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Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

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Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
No Way Back Home Mathematics 100
Beatboxer Symmetric Ciphers 150
MDFlag Hash Functions 125
TLS Handshake Crypto on the Web 15
Saying Hello Crypto on the Web 20
Weekly Top Users
#1 Devrar 4825
#2 remy_o 2255
#3 pot123 1920
#4 kusano 1825
#5 Glacier 1720
Recent Solves
Keyed Permutations UnderD0g
Great Snakes tzanonima
MDFlag Cib
Modular Inverting silentwulf01
Modular Arithmetic 2 silentwulf01
Recent Solutions
Lo-Hi Card Game ConnorM 0
ECB CBC WTF C3real 0
No Way Back Home GingerCarrot 0
Beatboxer AZ 0
Real Curve Crypto kiona 1

Level Up

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